A firewall is simply a program or hardware device that filters the information coming through the Internet connection. If incoming information is unusual by the filters, it is not allowed through.

Firewalls use one or more methods to control traffic flowing in and out of the network:

- Packet Filtering: Packets (small bits of data) are analyzed through a set of filters and then let through into the computer or to be discarded later

- Proxy Service - Information sent fro

The firewall design policy is specific to the firewall. It defines the rules used to implement the service access policy. Firewalls generally implement one of two basic design policies:

The level of security you establish will determine how many of these threats can be stopped by your firewall. The highest level of security would be to simply block everything. Obviously that defeats the purpose of having an Internet connection. You can always restrict traffic that travels through the firewall so that only certain types of information, such as e-mail can get through. This is a good rule for businesses that have an experienced network administrator that understands what the needs are and knows exactly what traffic to allow through. For most of us, it is probably better to work with the defaults provided by the firewall developer unless there is a specific reason to change it. One of the best things about a firewall from a security standpoint

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Approximate Word count = 643
Approximate Pages = 3 (250 words per page double spaced)